No company

OIK - Lenné3D Plant Distribution File
OIX - Lenné3D Plant Distribution File
ORE - 3WayPack
ORO - 3WayPack
O3 - Ozone Messenger Program Support Files
OUV - Sphinx Open Ended Responses
OVLDEF - Gestionnaire d'extensions Overload Definition
OZFX3 - OziExplorer Image File
OCEN - EdGCM Data File
OIT - SleepScan and Ceegraph Offset Index File
OK - Dot OK File Digest
OGNC - Web Page Source Code
OJP - 3WayPack
OLR - Openlab Raw Format
OLRW - Openlab Raw Format
OZF - Mozart Programming System Functor
OLB - AUTOGEN
OLB - MS Project Object Library
OLB - VAX Object Library
O - Object File
O - UNIX/GCC Object File
O$$ - Output File
O$$ - Sprint Outfile
O01 - Typhoon Voice File
O8O - Mediator5 Repositorytabs Vorlagen.006 File
OAF - ETH Oberon Applet File
OAF - Outrage Animation Rows
OAZ - NetFax Manager OAZ Fax File
OB - IMB LinkWay Object File
OB1 - OzWin CompuServe E-mail/Forum Access Saved Outbox File
OBE - Out Of Box Experience
OBE - System DLL Oobe File
OBJ - Metatools Object Bryce Support File
OBJ - Relocatable Object Code
OBJ - Wavefront 3D Object
OBK - Ubi Soft Chessmaster Opening Book File
OBN - Oberon-2 Module Source File
OBS - ObjectScript Script
OBS - OzWin CompuServe E-mail/Forum Access Saved Outbox File
OBTHEME - ObjectBar Theme File
OBV - ObjectScript Visual Interface
OCA - OLE Custom Control Library Information
OCA - Visual Basic Control Typelib Cache
OCC - DB/TextWorks Database Terms and Words
OCC - OptControlCentre Model File
OCF - Object Craft File
OCF - OM2Cipher File
OCM - Internet Odyssey 2 Update
OCM - Netscape Communicator Aim File
OCP - Advanced Art Studio
OCP - Offline Commander Project File
OCR - FAXGrapper FAX Text File
OCT - Octalizer Musical File
OCT - Radiance Octree Format
OC_ - Doko Compressed Install File
OD1 - Omnis5 Database File
OD2 - Omnis5 Database File
OD3 - Omnis5 Database File
OD4 - Omnis5 Database File
OD5 - Omnis5 Database File
OD6 - Omnis5 Database File
OD7 - Omnis5 Database File
OD8 - Omnis5 Database File
OD9 - Omnis5 Database File
ODA - CALS Group IV Type 2 Raster Image
ODA - ODA Document
ODA - Used with OCX
ODC - Office Data Connection
ODCCUBEFILE - Office Data Connection
ODCDATABASEFILE - Office Data Connection
ODCNEWFILE - Office Data Connection
ODCTABLEFILE - Office Data Connection
ODF - BattleZone Cartographers Guild File
ODF - Open Document Interchange
ODF - Star Trek Armada Ship/Structure Infomation
ODIF - Open Document Interchange Format
ODL - Object Definition Language
ODP - Oedipus
ODS - NCompass Labs Internet Script
ODZ - IBM OpenDoc Editor Package File
OEB - Outlook Express Backup Wizard
OEM - OEM Data Used During Device Install
OEM - SB_AWE Keys SB_NT File
OEM - Text Listing of Supported OEM Devices for WinNT
OF - Audio Utility Tuningwrench Compressed File
OF - LessDATA Video System OneFile File
OFC - Open Financial Connectivity File
OFD - ObjectView Form Defintion
OFF - 3D Mesh Object File Format
OFF - Vector Graphic
OFM - Embroidery Design File
OFM - OmniForm Form File
OFM - PostScript Font Description File
OFX - Olicom Fax
OFX - Open Financial Exchange File
OGF - Outrage Graphic Rows
OGG - Ogg Vorbis Codec Compressed WAV File
OGG - Salt Lake City Game File
OGL - Overlay Source Code
OGM - Ogg Vorbis Compressed Video File
OHP - DOS 7 File
OHS - Bink Outbound History
OID - Prosa/OM Object Interaction Diagram
OIF - QuickBase Web-sharable Database Interchange File
OIL - Open Image Library Format
OKT - Oktalyzer Tracker Module
OLD - Old Version
OLE - Object Linking and Embedding (OLE) Object
OLI - Olivetti Text File
OLK - MS Mail Mailbag Lock
OLL - TrialDirector Object Load List
OM - Omicron Compiler File
OMD - Prosa/OM Class Model
OMF - Open Media Format File
OMN - Omnipotent, Inc. Collection File
OMO - Oracle Media Objects File
OMS - Briggs Softworks Order Maven
OMS - Macintosh MP3 Music Format
OMS - Omega Downloader Configuration File
ON - Audio Utility Tuningwrench Compressed File
ONF - Open Navigation Format File
ONX - Onyx Graphics Postershop File
OOM - Shroom Swap File
OP - Rescue Disk File
OP2 - Musplay 1.72 File
OP2 - Outpost 2 Saved Game
OPC - Beta 44 Job File
OPC - Omron OPC Client File
OPF - Flip Album File
OPJ - OrCad Project File
OPM - Quadrox Digital CCTV System Components
OPN - Exact Active Options
OPT - Options/Configuration
OPT - QEMM Optimize
OPT - Segue SilkTest Option Set File
OPT - pcAnywhere Option Set File
OPX - Exact Inactive Options
OPX - Flip Album File
OPX - OPL Extension DLL
ORA - Oracle 7 Configuration
ORC - MIDI File
ORC - Oracle 7 Script
ORD - BC45 Owl File
ORF - Descent 3 Outrage Room Format
ORF - Olympus Digital Camera Raw Image File
ORG - Microcal Origin Plot
ORG - Netmino File
ORG - Origin File
ORI - Need for Speed-Hot Pursuit 2 File
ORI - Original
ORIG - Gen Original File
ORIGINAL - Netobjects Fusion Components BBScomp Message File
OS3 - OS/2 Warp 3 File
OSC - Formula One 2001 Options File
OSC - Fruitypro Samples SS_effects File
OSF - Distribution Bin File
OSF - ICZ OriSAFE
OSG - OSG321 Software Application Data File
OTB - On-the-air Bitmap
OTF - Open Type Font Format
OTH - Power Toys Other Folder Explorer Tool
OTHERFOLDER - Power Toys Other Folder Explorer Tool
OTL - Fookes Super NoteTab Template File
OTL - NoteTab Outline
OTL - OpenTrap Event Log
OTL - Ventura Publisher's Type Foundry Outline Editor format
OTL - Z-Soft Type Foundry Font
OTS - OtsJuke Sound File
OTX - Olivetti Olitext Plus File
OU! - OzWin CompuServe E-mail/Forum Access Outbound Messages Online
OUT - Outlines or Output File
OUT - OzWin CompuServe E-mail/Forum Access Outbound Messages
OV1 - Program File - Overlay
OV2 - Program File - Overlay
OV3 - Program File - Overlay
OVA - Sierra Web Studio Graphic
OVL - Program File - Overlay
OVM - BHV Tonstudio Platin File
OVR - Program File - Overlay
OVW - Cool Edit Pro Overview File
OVW - DIANA Overview File
OWD - OpenWire Project
OWL - BC45 Owl File
OX - Ox Object-Oriented Matrix Programming Language File
OXL - OMEGA Product Suite File
OXO - DB-MAIN Compiled Voyager-2 Program
OXO - Ox Object-Oriented Matrix Programming Language File
OYB - Organize Your Beanie Babies Data File
OYZ - Lotus Approach Alternate dBASE Index
OZM - Sharp Organizer Memo Bank
OZP - Sharp Organizer Telephone Bank
ONE - SEMONE Compressed Archive

20-20 Technologies

OFD - 20-20 Office Sales E-magine File

3am Solutions (UK) Limited

OPS - Dynamite VSP Object Placement Style

ABAQUS, Inc.

ODB - ABAQUS File

ABF software, Inc.

OB - ABF Outlook Backup Backup File

Adobe

OFM - Font

America Online, Inc.

OCM - AOL Advertising Control File

Atari

OVL - RollerCoaster Tycoon Program Sprite

Back To The Beach Software, LLC

OVA - Web Studio Project Page
OWS - Web Studio Project File

Borland Software Corporation

OBR - C++ Object Browser Data File
OGX - C++ Component Gallery Exported Classes and Resources
OHC - OpenHelp Table of Contents File
OHI - OpenHelp Index
OHL - OpenHelp Link
OHP - OpenHelp Project File
OPT - Delphi Project Options
OVD - ObjectVision Datafile

Cadence Design Systems, Inc.

OPJ - OrCAD Project File

Cakewalk

OVE - Cakewalk Overture Score

Comverse, Inc. a part of Comverse Technology

ODH - Odigo History File
ODU - Odigo User File

Corel Corporation

OBP - Bryce 5 Object Preset

Csounders

ORC - cSound Synthesis Instruments

Delmar Learning

OLB - Medical Terminology Challenge Data File

Des & Lorraine Newman

OZF2 - OziExplorer Map

Diffraction International

OPD - Durango Interferometry Software Document

DNA Software, Inc.

OPF - Visual OMP Project File

docPointer

ONE - docPointer Visual ReadMe File

Eagle Rock Enterprises, Inc.

OPN - Strip Poker Deluxe Opponent File

Efkasoft

OH - Overhoor
OH4 - Overhoor
OHW - Overhoor

Electronics Services Agency

OBA - Timespace X100 Digital Video Recorder Video File

Equis International

OSC - OptionScope Worksheet

ESRI

ODB - ArcView Object Database ASCII File

Florin Ghido

OFR - OptimFROG Encoded Audio

FPC Development Team

O - Free Pascal Object FIle for Linux or DOS Version
O1 - Free Pascal Object File for GO321v1 Platform
OO - Free Pascal Object File for OS/2 Version
OW - Free Pascal Object File for Windows Version

Fujitsu Denmark

OCS - eDoc DigiSign Digitally Signed Document

Gemstar eBook

OPF - Gemstar eBook Publisher Package

HumanConcepts, LLC

OPW - OrgPlus Organization Chart
OPX - OrgPlus Organization Chart
OV - OrgPlus OrgViewer File

Hyperion Solutions Corporation

OCE - Brio Query

IBM

OBX - Rational XDE
OND - Notes Database
OR2 - Organizer Ver 2 File
OR3 - Organizer 97 File
OR4 - Organizer
OR5 - Organizer
OR6 - Organizer Data File
OR8 - Rational Rose Oracle8 Database Model Report
ORG - Organiser
OST - Tivoli Storage Manager File

IMSI

OTM - IMSI Micro Cookbook File

Kepware Technologies Inc.

OPF - KEPServerEX Project Configuration File

Keronsoft

OPP - IPhoto File

mb Software AG

O2C - Objects to See 3D File Format

MicroImages, Inc.

OF - MicroImages Outline Font

Microsoft

OAB - Outlook Address Book
OAF - Flight Simulator Texture File
OB$ - Compressed OBJ
OBD - Office Binder Document
OBT - Office Binder Template
OBZ - Office Binder Wizard
OCA - Control Typelib Cache
OCX - Object Linking and Embedding
ODE - Office Object Data Embedding File
ODL - Visual C++ Type Library Source
ODS - Outlook Express Mailbox
OFN - Office FileNew File
OFT - Outlook Item Template
OLK - Outlook Address Book
OLN - Visual C++ Outline Examples
OLT - Visual C++ Outline Examples
ONE - OneNote Note File
OPC - Office Upgrade Control File
OPS - Office Profile Settings File
OPT - Developer Studio File Workspace Options
OPX - OrgChart Organization Diagram
OQY - Excel OLAP Query File
OSC - Remote Installation Services Client Installation Wizard File
OSD - Open Software Description File
OSS - Office Saved Search
OST - Exchange Offline File
OST - Outlook Offline File
OTM - Outlook VBA Module

Microsoft Corporation

OLB - Automation Object Library
OPX - OrgChart Organization Diagram
OFN - Systems Management Server
OFR - Systems Management Server

Mike Mardesich

OKS - OKScript File
OKX - OKScript File

Milenix Software

OUT - MyInfo Documnet/Outline

NewTek

OBJ - LightWave 3D Object

Nokia

OTB - Nokia Phone Graphics Editor
OTT - Nokia Phone Ring Tone

NovaStor Corporation

OUT - NovaBACKUP Backup Set

Objective Corporation Limited

OBR - Objective Reference Document Link

Obsidium Software

OPF - Obsidium Project File

Ockam Instruments, Inc.

OSL - OckamSoft Log File

OlapX Software

OXB - OlapX Report Portfolio
OXC - OlapX Cube Definition File
OXV - OlapX Local View File

OMAX Corporation

OMX - OMAX Make Tool Path File
ORD - OMAX Make Tool Path File

OnkoS

ODF - OnkoS Data
OGF - OnkoS Graphic File
OTF - OnkoS Text Data File
OVB - OnkoS Vocabulary Backup File
OWF - OnkoS Wave Data File

Opendisc

ODM - Opendisc Software

Opera Software ASA

OSF - Opera Skin

Oracle

OBD - Oracle Forms Online Help File

OrCAD

OLB - PSpice Capture Symbols Models

Organizers' Collaborative

ODB - Organizers Database

OriginLab

O - Origin C Compiled Program File
OGG - Origin Graphic File
OGM - Origin Matrix File
OGO - OriginPro Graphic Object File
OGS - Origin Script File
OGW - Origin Worksheet File
OPJ - Origin Project File
OPK - Origin Origin Pack File
OTM - Origin Matrix Template File
OTP - Origin Graphic Template File
OTW - Origin Worksheet Template File

OriginLab Corporation

OCB - Origin Precompiled Origin C File
OP - Origin Preprocessed Origin C File
OTH - Origin Graph Properties File

Ots Labs Pty Ltd

OMX - Ots Media Library

Outrage Entertainment

OSF - Descent 3 Sound File

Oxygen Software

OBK - Oxygen Phone Manager Phone Book

Oyez

OLF - OyezForms Legal Documents
OLV - OyezForms Legal Documents

Pathtrace Engineering Systems

ONE - EdgeCAM Licensing Data Ffile

Pervasive Software Inc.

OPT - Business Integrator Option File

Pinnacle Systems, Inc.

ORG - Hollywood FX Effects Organizer File

Psion PLC

ODB - Psion Organiser Datafile and LZ Diary File
OPA - Psion OPL Object File
OPL - Psion Organiser Programming Language Source File
OPO - Psion OPL Output Executable File
OPO - Psion Organiser OPL Code
OPT - Psion Organiser OPL Source
OPX - Psion Organiser Programming Language
OVX - Psion Oval Control

Psytek Ltd.

ORG - Odds Ratio Generator Data File

PTC

OUT - Pro/ENGINEER Temporary File

Rebel Software

OPN - Rebel Strip Poker Opponent File

Revelation Software

OV - OpenInsight Database Overflow File

ScanSoft, Inc.

OPD - OmniPage Document
OPJ - OmniPage Schedule
OTN - OmniPage Training File

Schneider Electric

OPT - ProWORX Nxt List Module Option File

Softex, Inc.

OPI - OmniPass Exported User

Softricity, Inc.

OSD - SoftGrid Program Description

Sony

ODA - AIBO Audio Voice
OMA - Sony Music Format File
OMG - OpenMG Jukebox

Stardock Corporation, Inc.

OBPACK - ObjectBar Object Package
OBSKIN - ObjectBar Skin File
OBTHEME - ObjectBar Theme File

Steinberg

OVW - Cubase .WAV File Image

Steinegger Software

OCD - OCAD Digitized Map

Sun

OSI - SunNet OSI Description File

Sun Microsystems, Inc.

ODB - OpenOffice/StarOffice OpenDocument
ODC - OpenOffice/StarOffice OpenDocument
ODF - OpenOffice/StarOffice OpenDocument
ODG - OpenOffice/StarOffice OpenDocument
ODI - OpenOffice/StarOffice OpenDocument
ODM - OpenOffice/StarOffice OpenDocument
ODP - OpenOffice/StarOffice OpenDocument
ODS - OpenOffice/StarOffice OpenDocument
ODT - OpenOffice/StarOffice OpenDocument
OTC - OpenOffice/StarOffice OpenDocument
OTF - OpenOffice/StarOffice OpenDocument
OTG - OpenOffice/StarOffice OpenDocument
OTH - OpenOffice/StarOffice OpenDocument
OTI - OpenOffice/StarOffice OpenDocument
OTP - OpenOffice/StarOffice OpenDocument
OTS - OpenOffice/StarOffice OpenDocument
OTT - OpenOffice/StarOffice OpenDocument

TAN$TAAFL Software Company

OTP - Top Secret Crypto Gold One Time Pad Key File

Tennessee Administrative Office of the Courts

OPN - Court Opinion File

The Digital Space Commons

OLV - OnLive! Traveler Sound File

The Shmoo Group

OSI - Osiris Database

The Three-Mode Company

OUT - 3WayPack

Themekit Systems Ltd.

ODT - MindRender Virtual Reality Explorer Kit

TomTom International BV

OV2 - TomTom Point of Interest File

TonyTown Software Ltd.

OOP - OOP Packer Archive

Toplevel Computing

OFD - OfficeForms Form Data File
OFM - OfficeForms Blank Form File

Voyetra Turtle Beach, Inc.

ORC - Digital Orchestrator Plus Sound File